Science, Tech, Math › Science PPM Definition (Parts Per Million) Scientific Meaning Print Martin Leigh / Getty Images Science Chemistry Basics Chemical Laws Molecules Periodic Table Projects & Experiments Scientific Method Biochemistry Physical Chemistry Medical Chemistry Chemistry In Everyday Life Famous Chemists Activities for Kids Abbreviations & Acronyms Biology Physics Geology Astronomy Weather & Climate By Anne Marie Helmenstine, Ph.D. Anne Marie Helmenstine, Ph.D. Chemistry Expert Ph.D., Biomedical Sciences, University of Tennessee at Knoxville B.A., Physics and Mathematics, Hastings College Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels. Learn about our Editorial Process Updated on March 25, 2019 PPM Definition: PPM stands for parts per million. It is commonly used to express concentration and temperature coefficients. Read More Parts Per Million Definition By Anne Marie Helmenstine, Ph.D. Also Known As: parts per million Examples: 100 ppm is identical to 0.01% Cite this Article Format mla apa chicago Your Citation Helmenstine, Anne Marie, Ph.D. "PPM Definition (Parts Per Million)." ThoughtCo, Aug. 27, 2020, thoughtco.com/ppm-definition-606763. Helmenstine, Anne Marie, Ph.D. (2020, August 27). PPM Definition (Parts Per Million). Retrieved from https://www.thoughtco.com/ppm-definition-606763 Helmenstine, Anne Marie, Ph.D. "PPM Definition (Parts Per Million)." ThoughtCo. https://www.thoughtco.com/ppm-definition-606763 (accessed March 28, 2024). copy citation